Razor knife



FIG. 1 is a front, left, top perspective view of a razor knife, showing our new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a rear elevational view thereof; and,

FIG. 7 is a bottom plan view thereof. 

I claim the ornamental design for a razor knife, as shown and described. 